Elements of Plane Geometry: For the Use of Schools |
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Page 31
... radius is a line drawn from the centre to the cir- cumference . All radii are equal . 5. A diameter is a line which passes through the cen- tre , and has its extremities in the circumference . ameter therefore is double the radius . In ...
... radius is a line drawn from the centre to the cir- cumference . All radii are equal . 5. A diameter is a line which passes through the cen- tre , and has its extremities in the circumference . ameter therefore is double the radius . In ...
Page 37
... radius CA. Again , only one circumference can pass through the three points A , B , D , because the lines EC , FC , inter- sect each other but once , and therefore there can be but one centre , and with the same centre and the same radius ...
... radius CA. Again , only one circumference can pass through the three points A , B , D , because the lines EC , FC , inter- sect each other but once , and therefore there can be but one centre , and with the same centre and the same radius ...
Page 38
... radius at its extremity is a tangent to the circle . Conversely . Every tangent to a circle is perpendicu- lar to the radius drawn to the point of contact . 1st . Let AB be perpen- dicular to the radius CD , at its extremity D ; then we ...
... radius at its extremity is a tangent to the circle . Conversely . Every tangent to a circle is perpendicu- lar to the radius drawn to the point of contact . 1st . Let AB be perpen- dicular to the radius CD , at its extremity D ; then we ...
Page 43
... radius longer than half of AB , describe an arc above the line AB , and another below it ; then , with B as a centre and the same radius , A. describe two arcs intersect- ing the two first at C and D , and draw the line CD , it will ...
... radius longer than half of AB , describe an arc above the line AB , and another below it ; then , with B as a centre and the same radius , A. describe two arcs intersect- ing the two first at C and D , and draw the line CD , it will ...
Page 44
... radius greater than half CD , describe two arcs cutting each other at B. Draw from B to A a line , and AI will be ... radius , describe an arc CB ; then , with B as a centre , and a radius equal to D A Fig . 45 . E B the chord FE ...
... radius greater than half CD , describe two arcs cutting each other at B. Draw from B to A a line , and AI will be ... radius , describe an arc CB ; then , with B as a centre , and a radius equal to D A Fig . 45 . E B the chord FE ...
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Elements of Plane Geometry: For the Use of Schools - Primary Source Edition Nicholas Tillinghast No preview available - 2013 |
Common terms and phrases
ABCD adjacent angles allel alternate angles altitude angle ABC angles ABD angles is equal antecedent and consequent B. I. Ax base centre circle whose radius circumference circumscribed circumscribed circle Converse of Prop describe an arc diagonal diameter divide draw the line equal angles equal B. I. Prop equal chords equal Prop equal respectively equiangular equivalent feet given angle given line given point given side half hence the triangles hypotenuse included angle inscribed angle Let the triangles line drawn linear units longer than AC multiplied number of sides oblique lines parallel to CD parallelogram perimeter perpendicular PROBLEM prove radii rectangle regular polygons respectively equal right angles Prop right-angled triangle Scholium sides AC similar subtended tangent THEOREM three sides triangles ABC triangles are equal vertex
Popular passages
Page 31 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Page 63 - The square described on the hypothenuse of a right-angled triangle is equivalent to the sum of the squares described on the other two sides.
Page 70 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.
Page 53 - In any proportion, the product of the means is equal to the product of the extremes.
Page 87 - The perimeters of two regular polygons of the same number of sides, are to each other as their homologous sides, and their areas are to each other as the squares of those sides (Prop.
Page 54 - In a series of equal ratios, any antecedent is to its consequent, as the sum of all the antecedents is to the sum of all the consequents. Let a: 6 = c: d = e :/. Then, by Art.
Page 81 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 59 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.
Page 61 - From this proposition it is evident, that the square described on the difference of two lines is equivalent to the sum of the squares described on the lines respectively, minus twice the rectangle contained by the lines.
Page 82 - The side of a regular hexagon inscribed in a circle is equal to the radius of the circle.